J. Alexander + Cornell accelerator group Cornell University Beam Instrumentation J. Alexander + Cornell accelerator group Cornell University LCCOM2 Instrumentation

LCCOM2 Instrumentation Beam Instrumentation Beam-based alignment => beam diagnostic devices are key elements of the machine. Very small beam emittance, very high resolution, long-term stability=> the devices themselves are extremely challenging. Beam instrumentation needed for a linear collider: high resolution beam position monitors, beam size (emittance) monitors, luminosity monitors, bunch length monitors, polarization monitors, specialized devices (e.g, halo monitors). LCCOM2 Instrumentation

Beam Instrumentation: What’s our plan? We will review the beam instrumentation needed for a linear collider, and identify development efforts for us to participate in. We will focus on key instrumentation which is most important for collider luminosity performance, as identified through discussion with experts in the field and the results of beam simulations. specialized instrumentation needed to understand and diagnose specific physics issues. topics for which our experience in instrumentation development is particularly relevant. LCCOM2 Instrumentation

Examples of key beam instrumentation devices The use of optical transition radiation and optical diffraction radiation to measure the beam size; Emittance measurements using optical transition radiation; Bunch tilt measurements from rf bpm’s Bunch length monitors based on rf deflection; Synchrotron radiation from gradient undulators as a single-pass beam size monitor; Real-time bunch-by-bunch relative luminosity monitor LCCOM2 Instrumentation

Examples of specialized beam instrumentation devices Beam monitors capable of single-turn vertical size measurements in the damping rings; Devices to measure the beam polarization in the damping ring and the linac; An ultra high resolution beam size monitor the beam at the IP; Beam halo measurement devices; Instruments to measure the electron cloud density in the positron damping rings. LCCOM2 Instrumentation

Beam Instrumentation: What’s our plan? We will joining existing efforts where appropriate, and work to develop designs and prototypes of devices and associated electronics. When possible, we will use Cornell’s linac and synchrotron beams, as well as CESR, as tools to test diagnostic devices and techniques. In conjunction with our simulation efforts, we will explore the implications of instrumentation performance limitations and reliability on the luminosity of the collider. Draft budget LCCOM2 Instrumentation